docs(samples): add region tags to update intent sample

samples/snippets/update_intent.py

@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+# [START dialogflow_es_update_intent]
 
 from google.cloud.dialogflow_v2 import IntentsClient
 from google.protobuf import field_mask_pb2
@@ -26,3 +27,4 @@ def update_intent(project_id, intent_id, display_name):
     update_mask = field_mask_pb2.FieldMask(paths=["display_name"])
     response = intents_client.update_intent(intent=intent, update_mask=update_mask)
     return response
+# [END dialogflow_es_update_intent]